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FEMA ELECTRÓNICA . Series K . K40-232
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1.28.5 Alarms in ‘Process slave’ mode
1.28 Configuration menu (cont.)
Alarm 1
Setpoint
Hysteresis
Setpoint 2
Active
Alarm type
Alarms in ‘pro-
cess slave’ mode
Activation delay
Dectivation delay
Inverted relay
Locked alarm
Reading
Time
setpoint
hysteresis
Alarm as maximum,
no hysteresis, no delays
on
off
Time
activation
delay
on
off
deactivation
delay
Time
Alarm as maximum,
with hysteresis and delays
on
off
Time
Alarm as minimum,
no hysteresis, no delays
Reading
Time
Setpoint 2
Setpoint 1
Alarm as minimum,
with double setpoint,
no hysteresis, no delays
on
off
Time
Menu available only in ‘Process slave’ mode. Alarms are locally con -
trolled from the instrument. Operator must manually configure the
alarm parameters for each alarm.
To configure an alarm, enter into the alarm menu (‘ ALr1 ’, ‘ ALr2 ’ or
‘ ALr3 ’) and configure the following parameters :
• select ‘ Active ’ (‘ Act ’) to ‘ on ’
• at ‘ Alarm type ’ (‘ TypE ’) select the alarm to act as a maximum type
alarm (‘ MAX ’) or a minimum type alarm (‘ MIn ’). The maximum type
alarm (or minimum type alarm) activates when the display value is
higher (or lower) than the setpoint value. Select ‘watchdog’ (‘ W.
doG ’) alarm to activate the alarm when the ‘watchdog’ error acti -
vates (see section 1.25) .
• at ‘ Setpoint ’ (‘ SEt ’) enter the value for the alarm activation point
.
This parameter is eligible for configuration through the ‘
Fast access
’
menu
(see section 1.28.6).
• configure the hysteresis value at ‘ Hysteresis ’ (‘ hySt ’). The hyster -
esis applies to the deactivation process of the alarm. The alarm de -
activates when the reading has passed the setpoint value plus the
hysteresis value. Hysteresis helps to avoid repetitive switching of the
alarm relays, due to fluctuating input signals around the setpoint.
• at ‘ Activation delay ’ (‘ dEL.0 ’) configure the delay to apply before
alarm activation. The activation delay starts counting when the set -
point value is passed. Value from 0.0 to 99.9 seconds.
• at ‘ Deactivation delay ’ (‘ dEL.1 ’) configure the delay to apply
before alarm deactivation. The deactivation delay starts counting
when the setpoint value plus the hysteresis value, is passed. Value
from 0.0 to 99.9 seconds.
• to work with ‘windowed alarms’ (see graphical example below)
activate ‘ Setpoint 2 ’ (‘ SEt2 ’) to ‘ on ’ and then configure the desired
second setpoint value. Second setpoint must always be higher in
value than the first setpoint.
• the ‘ Relay inverted ’ (‘ r.Inv ’) parameter inverts the normal relay
connections. When set to ‘ on ’ the relay will be active when alarm is
inactive. For security applications where an inactive relay controls
the shutdown of the system.
• the ‘
Locked alarm ’ (‘ A.Lck ’) parameter disables the automatic
deactivation of the alarm. Alarm deactivation must be performed
manually, by pressing the ‘LE’ front button
(see section 1.28.11)